This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The VRFieldOfView() constructor creates a new VRFieldOFView object.

Note: This constructor was part of the old WebVR API. It has been superseded by the WebXR Device API.


There are two forms of this constructor, which take their information in slightly different ways. The first one accepts four separate arguments — the VRFieldOfView.upDegrees, VRFieldOfView.rightDegrees, VRFieldOfView.downDegrees, and VRFieldOfView.leftDegrees values you want the field of view to have

var myFOV = new VRFieldOfView(upDegrees, rightDegrees, downDegrees, leftDegrees);

The second one takes a VRFieldOfViewInit object as a single argument, which is just a dictionary containing the four degree values mentioned above:

var init = {upDegrees:up,rightDegrees:right,downDegrees:down,leftDegrees:left}
var myFOV = new VRFieldOfView(init);


  • Four argument version:

    The number of degrees upwards that the field of view will extend in.
    The number of degrees to the right that the field of view will extend in.
    The number of degrees downwards that the field of view will extend in.
    The number of degrees to the left that the field of view will extend in.
  • One argument version:

    A dictionary object containing the four degree values specified above.


The following simple example shows a function that can be used to set a custom field of view with four specified degree values for up, right, down and left. The VRFieldOfView() constructor is used to create a VRFieldOfView object from the supplied values, which is then fed into the HMDVRDevice.setFieldOfView method.

function setCustomFOV(up,right,down,left) {
  var testFOV = new VRFieldOfView(up,right,down,left);


  var lEye = gHMD.getEyeParameters('left');
  var rEye = gHMD.getEyeParameters('right');

Note: When testing, setting a weird/tiny field of view can really mess up your view. It is a good idea to grab the current field of view first (using VREyeParameters.fieldOfView) before making any drastic changes, so you can reset it afterwards if needed.


This constructor was part of the old WebVR API that has been superseded by the WebXR Device API. It is no longer on track to becoming a standard.

Until all browsers have implemented the new WebXR APIs, it is recommended to rely on frameworks, like A-Frame, Babylon.js, or Three.js, or a polyfill, to develop WebXR applications that will work across all browsers [1].

Browser compatibility

BCD tables only load in the browser

See also